1,3-Cyclopentadiene, 5-(1-methylethylidene)- 1,3-Cyclopentadiene, 5-isopropylidene- 2175-91-9 5-Isopropylidene-1,3-cyclopentadiene 6,6'-Dimethylfulvene 6,6-Dimethylfulvene Dimethylfulvene Isopropylidenecyclopentadiene NSC132350